package com.atguigu.gulimall.product.service.impl;

import org.checkerframework.checker.units.qual.C;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl <CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map <String, Object> params) {
        IPage <CategoryEntity> page = this.page(
                new Query <CategoryEntity>().getPage(params),
                new QueryWrapper <CategoryEntity>()
        );

        return new PageUtils(page);
    }


    @Override
    public List <CategoryEntity> listWithTree() {
        //1.查询所有数据
        List <CategoryEntity> categoryEntities = baseMapper.selectList(null);
        //2.组成数据树

        List <CategoryEntity> level1Menus = categoryEntities.stream().filter((categoryEntitie) -> {
            return categoryEntitie.getParentCid() == 0;
        }).map((menu) -> {
            menu.setChildren(getChildrens(menu, categoryEntities));
            return menu;
        }).sorted((menu1,menu2) -> {
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return level1Menus;
    }

    public List <CategoryEntity> getChildrens(CategoryEntity root, List <CategoryEntity> all) {
        List <CategoryEntity> children = all.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map((categoryEntity) -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

    @Override
    public void removeMenusByIds(List<Long> asList) {

        //  //检查当前菜单是否被其他地方引用
        baseMapper.deleteBatchIds(asList);

    }
}